2012 Mazda MAZDA5

During July of 2021 brake pedal went all the way down with no braking. Pumping the pedal restored braking. After the 3rd incident, had the master cylinder replaced on July 30, 2021 by certified mechanics. Brakes seemed fine, but on Aug 11, 2021 brake pedal went all the way down producing no braking on 3 occasions. Pumping the pedal restored braking. Took vehicle back to garage. Mechanics have not gotten it to fail. Possible new parts are bad? Could anti lock brake system cause this? Its been a really good car for 155,000 miles, but now I'm afraid to drive it.

TL* THE CONTACT OWNS A 2012 MAZDA 5. WHILE DRIVING APPROXIMATELY 5 MPH, THE BRAKE PEDAL TRAVELED TO THE FLOORBOARD WHEN IT WAS DEPRESSED. THERE WERE NO WARNING INDICATORS ILLUMINATED. A LOCAL DEALER WAS NOT CONTACTED. THE VEHICLE WAS TAKEN TO AN INDEPENDENT MECHANIC WHERE IT WAS DIAGNOSED THAT THE ANTI LOCK BRAKE SYSTEM NEEDED TO BE REPLACED. THE VEHICLE WAS REPAIRED. THE MANUFACTURER WAS NOT MADE AWARE OF FAILURE. THE VIN WAS UNKNOWN. THE APPROXIMATE FAILURE MILEAGE WAS 90,000.

STARTING A FEW MONTHS AGO, MY STEERING WHEEL SHIMMIED AS I WAS BRAKING. IT WAS INTERMITTENT. IN MAY, THE SHAKING DISAPPEARED BUT A SLIGHT GRINDING SENSATION(NO NOISE) COULD BE FELT WHEN I APPLIED THE BRAKE PEDAL. I DIDN'T THINK IS WAS A BRAKE WEAR PROBLEM SINCE THE CAR WAS RELATIVELY NEW AND I LIVE IN A FLAT AREA WITH NO UNUSUAL STRESS ON THE BRAKES. I WAS ON VACATION FOR A FEW MONTHS AND DID NOT DRIVE THE CAR. MY HUSBAND DROVE IT ONCE AND FELT IT WASN'T SAFE TO DRIVE BECAUSE OF WEAK BRAKING. I TOOK IT TO THE DEALER WHEN I RETURNED. MY BRAKING DISTANCE WAS DOUBLE OF WHAT IT USED TO BE. I FELT UNSAFE DRIVING THE CAR THE 5 MILES TO THE DEALERSHIP. THE DEALER SEEMED TO KNOW THAT MAZDA WOULD PROBABLY FIX THE ISSUE EVEN THOUGH BRAKE ISSUES ARE USUALLY CONSIDERED NORMAL WEAR AND TEAR. I WAS TOLD THAT MAZDA DID FIX THE PROBLEM AT NO CHARGE AND THAT THERE HAD BEEN A DESIGN FLAW WITH THE 2012 MAZDA5'S ROTORS. I WAS TOLD THEY WERE TOO THIN IN THE ORIGINAL DESIGN AND THUS WORE OUT QUICKLY. THEY ALSO INDICATED THEY HAD FIXED IT IN MORE RECENT MODELS. I FEEL THAT THIS SHOULD HAVE BEEN A FORMAL RECALL. THE CAR RAPIDLY WENT FROM A INTERMITTENT BOTHER TO A TRUE SAFETY ISSUE. I CONTINUALLY WORRIED THAT I MIGHT HAVE TO STOP QUICKLY AND WOULD NOT BE ABLE TO. *TR